Performing verification for mantic. I started two VMs. A jammy VM for the cifs server, and a mantic VM, for the client.
I set the jammy VM up as per the testcase. I set the mantic VM up as per the testcase. The mantic VM uses kernel 6.5.0-25-generic from -updates. $ uname -rv 6.5.0-25-generic #25-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb 7 14:58:39 UTC 2024 I created the testdata, took the SHA256 hash, and copied it over: $ ( set -o pipefail && head --bytes=$(( 55 * 1000 )) /dev/zero | openssl enc -aes-128-ctr -nosalt -pass "pass:my-seed" -iter 1 | hexdump --no-squeezing --format '40/1 "%02x"' --format '"\n"' >"testdata.txt" ) $ sha256sum testdata.txt 9ec09af020dce3270ea76531141940106f173c7243b7193a553480fb8500b3f2 testdata.txt $ cp testdata.txt share/ On the jammy VM, I confirmed the hash has changed: $ sha256sum sambashare/testdata.txt 9e573a0aa795f9cd4de4ac684a1c056dbc7d2ba5494d02e71b6225ff5f0fd866 sambashare/testdata.txt $ less sambashare/testdata.txt Looking at the file with less, I see the large blocks of zeros. I then enabled -proposed, and installed 6.5.0-27-generic: $ uname -rv 6.5.0-27-generic #28-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 7 18:21:00 UTC 2024 I mounted the share: $ sudo mount -t cifs -o username=ubuntu,vers=1.0,wsize=16850 //192.168.122.65/sambashare ~/share Password for ubuntu@//192.168.122.65/sambashare: Looking in dmesg, I see: [ 57.280020] Key type cifs.spnego registered [ 57.280035] Key type cifs.idmap registered [ 57.280345] Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers [ 57.280861] CIFS: VFS: Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers [ 57.281307] CIFS: VFS: wsize rounded down to 16384 to multiple of PAGE_SIZE 4096 [ 57.281599] CIFS: Attempting to mount //192.168.122.65/sambashare the line of interest is "CIFS: VFS: wsize rounded down to 16384 to multiple of PAGE_SIZE 4096" showing we now have a wsize of 16384, and we can see this with mount -l: $ mount -l //192.168.122.65/sambashare on /home/ubuntu/share type cifs (rw,relatime,vers=1.0,cache=strict,username=ubuntu,uid=0,noforceuid,gid=0,noforcegid,addr=192.168.122.65,soft,unix,posixpaths,serverino,mapposix,acl,rsize=1048576,wsize=16384,bsize=1048576,echo_interval=60,actimeo=1,closetimeo=1) I then copied the file over: $ cp testdata.txt share/ Looking at the SHA256 sum on the Jammy server: $ sha256sum sambashare/testdata.txt 9ec09af020dce3270ea76531141940106f173c7243b7193a553480fb8500b3f2 sambashare/testdata.txt When looking at the file with less, there are no more binary zeros. The kernel in -proposed fixes the issue, happy to mark verified for mantic. ** Tags removed: verification-needed-mantic-linux ** Tags added: verification-done-mantic-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2049634 Title: smb: wsize blocks of bytes followed with binary zeros on copy, destroying data To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2049634/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
